#include
#include
int?main（）{
	int?sanjiao（double?adouble?bdouble?c）;
	int?l;
	double?abc;
	printf（“菜單，請按要求輸入你想要的定積分：\n1.三角函數\n2.指數函數\n3.逆函數\n4.常函數?\n5.?一元多次函數\n“）;?
	scanf（“%d“&l）;
	getchar（）;
	if（a=1）sanjiao（abc）;else
	if（a=2）;else
	if（a=3）;else
	if（a=4）;else
	if（a=5）;else
	puts（“超出范圍\n“）;
}
int?sanjiao（double?adouble?bdoub